Final design updates to emoji font

Test: m fontchain_lint
Test: flashed device, confirmed can see emoji including U13 using test app that renders go/emoji-ordering [flyouts included in flat list] using the system emoji font.
Bug: 151964652
Change-Id: I82cca119aec5f51047d2c5773fd63771254afaf8
Merged-In: I05d81b7367a37800f8541af3b66bbefac286dbe2